我有一個 recyclerView，它使用來自 firebase 資料庫的資料在 cardview 中顯示專案。我撰寫了在單擊專案時啟動新活動的編碼。現在我想將從 recyclerView 中單擊的專案的資料傳遞給新的活動，以便我可以在其中顯示資料。我正在使用科特林。我在 yt 上觀看了一些視頻并嘗試了幾種方法。由于我是初學者，我需要幫助來解決這個問題。提前致謝。
我有一個 RecyclerItemClickListener ，它在單擊專案時啟動新活動。
RecyclerView 類
class storekotlin : Fragment() {
private var param1: String? = null
private var param2: String? = null
var recyclerView: RecyclerView? = null
var productlist = ArrayList<Product>()
private var database: FirebaseDatabase? = null
private var reference: DatabaseReference? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
arguments?.let {
param1 = it.getString(ARG_PARAM1)
param2 = it.getString(ARG_PARAM2)
}
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
var view = inflater.inflate(R.layout.fragment_storekotlin, container, false)
database = FirebaseDatabase.getInstance()
reference = database?.getReference("Products")
val FirebaseListener = object: ValueEventListener {
override fun onDataChange(p0: DataSnapshot) {
val child = p0.children
child.forEach{
var products = Product(it.child("img").value.toString(),
it.child("name").value.toString(), it.child("price").value.toString())
productlist.add(products)
}
val adapter = ProductAdapter(productlist)
recyclerView?.adapter = adapter
}
override fun onCancelled(p0: DatabaseError) {
}
}
reference?.addValueEventListener(FirebaseListener)
recyclerView = view.findViewById(R.id.recyclerview)
recyclerView?.setHasFixedSize(true)
recyclerView?.layoutManager = GridLayoutManager(activity, 1,
GridLayoutManager.VERTICAL, false)
val defuserimg: ImageView = view.findViewById(R.id.defuserimg)
val defuser: TextView = view.findViewById(R.id.defuser)
val info: ImageView = view.findViewById(R.id.info)
val search: EditText = view.findViewById(R.id.search)
defuserimg.setOnClickListener {
val intent = Intent(activity, signin_page::class.java)
startActivity(intent)
}
defuser.setOnClickListener {
val intent = Intent(activity, signin_page::class.java)
startActivity(intent)
}
info.setOnClickListener {
val intent = Intent(activity, aboutpage::class.java)
startActivity(intent)
}
recyclerView?.addOnItemTouchListener(
RecyclerItemClickListener(
activity, recyclerView!!, object :
RecyclerItemClickListener.OnItemClickListener {
override fun onItemClick(view: View, position: Int) {
val intent = Intent(activity, productdetails::class.java)
startActivity(intent)
}
override fun onLongItemClick(view: View, position: Int) {
}
})
)
return view
}
companion object {
@JvmStatic
fun newInstance(param1: String, param2: String) =
storekotlin().apply {
arguments = Bundle().apply {
putString(ARG_PARAM1, param1)
putString(ARG_PARAM2, param2)
}
}
}
}
RecyclerAdapter 類
class ProductAdapter(private var productlist:MutableList<Product>):
RecyclerView.Adapter<ProductAdapter.ProductViewHolder>() {
override fun onCreateViewHolder(
parent: ViewGroup,
viewType: Int
): ProductViewHolder {
val layoutView:View =
LayoutInflater.from(parent.context).inflate(R.layout.itemcard,parent,false)
return ProductViewHolder(layoutView)
}
override fun onBindViewHolder(holder: ProductViewHolder, position: Int) {
Picasso.get().load(productlist[position].prdimg).into(holder.prdimg)
holder.prdname.text = productlist[position].prdname
holder.prdprice.text = productlist[position].prdprice
}
override fun getItemCount(): Int {
return productlist.size;
}
inner class ProductViewHolder(view: View): RecyclerView.ViewHolder(view){
var prdimg: ImageView = view.findViewById(R.id.prdimg)
var prdname: TextView = view.findViewById(R.id.prdname)
var prdprice: TextView = view.findViewById(R.id.prdprice)
}
uj5u.com熱心網友回復：
最簡單的方法
在配接器類中喜歡
class ProductAdapter(val fragment: storekotlin,private var productlist:MutableList<Product>):
RecyclerView.Adapter<ProductAdapter.ProductViewHolder>() {
override fun onCreateViewHolder(
parent: ViewGroup,
viewType: Int
): ProductViewHolder {
val layoutView:View =
LayoutInflater.from(parent.context).inflate(R.layout.itemcard,parent,false)
return ProductViewHolder(layoutView)
}
override fun onBindViewHolder(holder: ProductViewHolder, position: Int) {
Picasso.get().load(productlist[position].prdimg).into(holder.prdimg)
holder.prdname.text = productlist[position].prdname
holder.prdprice.text = productlist[position].prdprice
holder.itemView.setOnClickListener {
val name = productlist[position].prdname
val price= productlist[position].prdprice
fragment.deatailsList(name , price) // here you can send just the position it will be more efficient
}
}
override fun getItemCount(): Int {
return productlist.size;
}
inner class ProductViewHolder(view: View): RecyclerView.ViewHolder(view){
var prdimg: ImageView = view.findViewById(R.id.prdimg)
var prdname: TextView = view.findViewById(R.id.prdname)
var prdprice: TextView = view.findViewById(R.id.prdprice)
}
在 storekotlin Fragment onCreateView 方法中，像這樣傳遞串列和片段
val adapter = ProductAdapter(this@storekotlin,productlist)
recyclerView?.adapter = adapter
在 storekotlin 活動中創建另一種方法
fun deatailsList(name: String, price: String?) {
// Log.d(ContentValues.TAG, "myList:${dataList.size}")
val intent = Intent(requireContext(), DetailsActivity::class.java)
intent.putExtra("nameKey", name)
intent.putExtra("priceKey", price)
startActivity(intent)
}
在 Details 活動中的 onCreate 方法
val intent = intent
val rcvName = intent.getStringExtra("nameKey")
val rcvPrice= intent.getStringExtra("priceKey")
// now you can print here the selected value
textDayIncome_id.text = rcvName
textDayExpense_id.text = rcvPrice
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標籤：安卓 火力基地 科特林 android-recyclerview